| 摘要 |
PROBLEM TO BE SOLVED: To provide a bottom spin valve magnetometric sensor using GMR, which can read out magnetic information with a surface recording density exceeding 9.3 x 10<SP>4</SP>Gbit/m<SP>2</SP>. SOLUTION: A new seed layer which consists of NiCr whose Cr(chromium) percentage content is 31at % and has thickness of about 3nm, is used for forming the bottom spin valve magnetometric sensor having a synthetic antiferromagnetic pinned layer. Providing this seed layer regenerates a magnetic medium which is recorded with a recording density exceeding 9.3 x 10<SP>4</SP>Gbit/m<SP>2</SP>(=60 Gbit/inch<SP>2</SP>). That is, providing this seed layer enables forming a pinning layer (MnPt layer) which is very thin (thickness of about 8 nm) similarly as a pinned layer or a free layer. Further, giving a high pinning magnetic field and optimizing a magnetostriction value makes a very hard magnetometric sensor. COPYRIGHT: (C)2004,JPO&NCIPI |
